Abstract
The asymmetry in the azimuthal angle distribution of hadrons produced in unpolarized Semi-Inclusive Deep Inelastic Scattering (SIDIS) carries information on the intrinsic transverse momentum of the quark and on the still unknown Boer-Mulders parton distribution function . Using the data collected in 2016 and 2017 with 160 GeV/c muon beams scattering off a liquid hydrogen target, the COMPASS Collaboration is measuring the azimuthal asymmetries , and for charged hadrons. The preliminary results shown here confirm the strong kinematic dependencies observed in previous measurements conducted by COMPASS, HERMES and CLAS. The contribution from hadrons produced in the decay of vector mesons diffractively produced is also discussed.
Highlights
IntroductionOne of the building blocks needed for a complete transverse-momentum-dependent (TMD)
One of the building blocks needed for a complete transverse-momentum-dependent (TMD)description of the nucleon structure is the still unknown Boer-Mulders parton distribution function (TMD-PDF) h⊥1
1 + ε1AcUoUs φh cos φh + ε2AcUoUs 2φh cos 2φh + ε3λAsLinUφh sin φh where x is the Bjorken variable, y is the fraction of the beam energy carried by the virtual photon, z is the fraction of the photon energy carried by the hadron, φh the hadron azimuthal angle in Gamma-Nucleon System (GNS)
Summary
One of the building blocks needed for a complete transverse-momentum-dependent (TMD). Description of the nucleon structure is the still unknown Boer-Mulders parton distribution function (TMD-PDF) h⊥1. It encodes the correlation between the quark transverse momentum and its transverse spin in an unpolarized nucleon. The fully differential cross section for the production of a hadron h of transverse momentum PhT in the Gamma-Nucleon System (GNS) reads [1]: dσ dPh2T dxdydzdφh = σ0. The εi terms are kinematic factors depending on y and λ is the beam polarization. Up to order 1/Q, the Boer-Mulders TMD h⊥1 enters the expression of the two azimuthal asymmetries AcUoUs φh and AcUoUs 2φh : AcUoUs φh.
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